pathways: chevrons float fully off the tile and only for the current tile; hover zone covers them; ghost hide is debounced

- chevrons sit entirely in the gap outside the tile (never half-on the photo)
  and are drawn only for the current tile, killing the mosaic clutter
- nav zones extend 44px outward so the whole chevron is inside the hit area;
  previously the chevron straddled the edge and its outer half was outside the
  zone, so mousing across it flipped the ghost on/off (the flicker)
- ghost hide is debounced 80ms and cancelled on the next hover target, so
  crossing the gap between a zone and its dropzone no longer blinks the ghost
- setCurrent re-renders navs so chevrons track the current tile

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